Avaya Configuring ATM and MPLS Services Uživatelský manuál Strana 32

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Configuring ATM and MPLS Services
1-2
117374-C Rev 00
ATM General Information
Asynchronous transfer mode (ATM) is a connection-oriented, cell-based
technology that relays traffic across a Broadband Integrated Services Digital
Network (B-ISDN). ATM provides a cost-effective way of transmitting voice,
video, and data across a network.
ATM Cells
An ATM cell is a fixed-length packet of 53 bytes. It consists of a 5-byte header
containing address information and a fixed, 48-byte information field. Figure 1-1
shows a diagram of an ATM cell.
Figure 1-1. ATM Cell
This fixed-length cell size allows you to predict network delays, making ATM
suitable for carrying real-time information (for example, voice and video) as well
as data.
ATM allows the network to operate at a much higher rate than typical
packet-switching protocols (for example, X.25), because it provides no error
protection or flow control. Instead, ATM relies on the source and destination
devices to perform error-recovery functions such as retransmission of lost packets.
48-byte
information field
5-byte
header
ATM0001A
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